title: Preparation and Cytotoxic Evaluation of Magnetite (Fe3O4) Nanoparticles on Breast Cancer Cells and its Combinatory Effects with Doxorubicin used in Hyperthermia.
abstract: BACKGROUND
  Magnetic nanoparticles in a variable magnetic field are able to produce heat. This heat (42-45°C) has more selective effect on fast dividing cancer cells than normal tissues.
  
  
  METHODS
  In this work magnetite nanoparticles have been prepared via co-precipitation and phase identification was performed by powder x-ray diffraction (XRD). Magnetic parameters of the prepared nanoparticles were measured by a Vibrating Sample Magnetometer (VSM). A sensitive thermometer has been used to measure the increase of temperature in the presence of an alternating magnetic field. To evaluate the cytotoxicity of nanoparticles, the suspended magnetite nanoparticles in liquid paraffin, doxorubicin and a mixture of both were added to the MDA-MB-468 cells in separate 15 ml tubes and left either in the RT or in the magnetic field for 30 min. Cell survival was measured by trypan blue exclusion assay and flow cytometer. Particle size distribution of the nanoparticles was homogeneous with a mean particles size of 10 nm. A 15°C temperature increase was achieved in presence of an AC magnetic field after 15 min irradiation.
  
  
  RESULTS
  Biological results showed that magnetite nanoparticles alone were not cytotoxic at RT, while in the alternative magnetic filed more than 50% of cells were dead. Doxorubicin alone was not cytotoxic during 30 min, but in combination with magnetite more than 80% of the cells were killed.
  
  
  CONCLUSIONS
  It could be concluded that doxorubicin and magnetite nanoparticles in an AC magnetic field had combinatory effects against cells.
authors.affiliation: School of Pharmacy, Isfahan Pharmaceutical Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Hojjat
authors.initials: H
authors.lastname: Sadeghi-Aliabadi
authors.forename: Morteza
authors.initials: M
authors.lastname: Mozaffari
authors.forename: Behshid
authors.initials: B
authors.lastname: Behdadfar
authors.forename: Maryam
authors.initials: M
authors.lastname: Raesizadeh
authors.forename: Hamid
authors.initials: H
authors.lastname: Zarkesh-Esfahani
keywords: Doxorubicin; Flow cytometry; Hyperthermia; Magnetite nanoparticles